LIST OF MICROSCOPICAL SPECIMEKS. 279 | 



No. of diameters j 



No. magnified. i 



125. Distribution of nerve-fibres, with highly convoluted ; 



ramifications and bioplasts, constituting the ' end- j 



organs.' Muscle of white mouse . . . . 215 1 



126. Nerve-fibres with 'end-organs.' Muscular fibres ' 



of rat 700 j 



127. Ultimate distribution of fine pale nerve-fibres to ! 



voluntary muscle. Frog. In the centre of the j 



field is seen a branching muscular fibre, the fibres I 



resulting from the subdivision of the muscular • 

 trunk, gradually taper into thin threads, which 



are inserted into the connective tissue. Networks j 



of pale nerve-fibres are se«n in all i)arts of the < 



preparation, but the muscular tissue has. been < 



removed . . . . . . . • . • • • 220 j 



128. Ultimate distribution of finest nerves as networks i 



and plexuses in the mylohyoid m uscle of the hyla or j 



green tree fi'og. These fibres are veiy narrow, and i 



at the same time each is separated by a distinct 

 interval from its neighbours. See pi. VlII, fig. 1. 

 The state of things is, therefore, very favourable 

 for the observation of the ' end-organs' if they are ! 



present. I have never been able to discover one 

 in thie beautiful example of voluntary muscle, , 



though I have found them in many other speci- < 



mens of muscle. Nerve-fibi-es may be traced for ' 



an immense distance from the bundles of dark- 

 bordered fibres. Gradually they become less than i 

 the ^po^ooo of an inch in diameter, but still divide 

 and subdivide into fine threads with oval bio- 

 plasts or nuclei at intervals, which, now running ; 

 parallel with the muscular fibre, then crossing it, ' 

 divide into branches, some of which after piu'su- 

 ing a very long course may at last be traced to a i 

 dark-bordered fibre in another part of the muscle. 

 I have succeeded in doing this in many different , 

 specimens. The failure of others to obtain speci- 

 mens cKhibiting the same appearances no doubt I 

 depends upon a veiy difierent method of investi- j 

 gation having been pursued. Anatomists for the j 

 most part have not only failed to observe what I 

 have seen, but many have not yet succeeded in i 

 demonstrating the fine pale nucleated fibres I de- i 

 monstrated long ago in almost every tissue of the i 

 frog.. 700 j 



